<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <div>
            <span>姓名:</span>
            <input v-model="name" type="text" />
        </div>
        <div>
            <span>年龄:</span>
            <input v-model="age" type="number" />
        </div>
        <div>
            <span>性别:</span>
            <select v-model="gender">
                <option value="男">男</option>
                <option value="女">女</option>
            </select>
        </div>
        <div>
            <button @click="add">添加/修改</button>
        </div>
        <div>
            <table border="1" cellpadding="10" cellspacing="0">
                <tr>
                    <th>序号</th>
                    <th>姓名</th>
                    <th>年龄</th>
                    <th>性别</th>
                    <th>操作</th>
                </tr>
                <tr v-for="(item,index) in arr" :key="item.id">
                    <td>{{index + 1}}</td>
                    <td>{{ item.name}}</td>
                    <td>{{item.age}}</td>
                    <td>{{item.gender}}</td>
                    <td>
                        <button @click="del(item.id)">删除</button>
                        <button @click="bianji(index)">编辑</button>
                    </td>
                </tr>
            </table>
        </div>
    </div>
    <script src="./vue.js"></script>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                name: '',
                age: '',
                gender: '男',
                changeid: -1,

                arr: [
                    {
                        id: 1,
                        name: '张三',
                        age: 25,
                        gender: '男'
                    },
                    {
                        id: 2,
                        name: '李四',
                        age: 30,
                        gender: '女'
                    },
                    {
                        id: 3,
                        name: '王五',
                        age: 28,
                        gender: '男'
                    }
                ]

            },
            methods: {

                add() {
                    if (this.arr.includes(this.arr[this.changeid])) {
                        this.arr.splice(this.changeid, 1, {
                            id: Date.now(),
                            name: this.name,
                            age: this.age,
                            gender: this.gender
                        })
                        this.name = ''
                        this.age = ''
                        this.changeid = -1
                        

                    } else {
                        if (!this.name.trim()) {

                            return alert('请输入姓名')
                        } else if (!this.age) {

                            return alert('请输入年龄')
                        } else {

                            this.arr.push({
                                id: Date.now(),
                                name: this.name,
                                age: this.age,
                                gender: this.gender
                            })
                            this.name = ''
                            this.age = ''

                        }
                    }

                },
                bianji(index) {
                    this.name = this.arr[index].name
                    this.age = this.arr[index].age
                    this.gender = this.arr[index].gender
                    this.changeid = index
                    console.log(this.changeid);

                },
                del(id) {
                    this.arr = this.arr.filter(item => item.id !== id)
                }

            },

        }
        )
    </script>
</body>

</html>